Little Audio App is a handy tool to play and export almost any file that contains audio.

It can handle almost anything you throw at it, as long as the file contains audio in some form. Everything from odd audio formats to movie file containers and you can export everything back to AAC or Apple Lossless.

Open and play/export audio from any file that contains audio.
Supports a vast array of formats.
Export to AAC or Apple Lossless.
Automatically add to iTunes.
10 band Equalizer with many presets.
Written in Swift for optimal performance and security.
Optimized for Yosemite and El Capitan.

More info: https://itunes.apple.com/us/app/little-audio-app/id1095256388?mt=12